/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraComponent.h
Sets whether or not the delta time used to tick the system instance when using desired age is locked to the seek delta. When true, the system instance will only be ticked when the desired age has changed by more than the seek delta. When false the system instance will be ticked by the change in desired age when not seeking.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category=Niagara, Meta=(DisplayName="Set whether or not to lock the desired age delta time to the seek delta.")) void SetLockDesiredAgeDeltaTimeToSeekDelta ( bool bLock )